Improvement in spring-whiffletrees



A. B. KIN G.

SPRING-WHIFFLETREESL,

.PatentebAug. 28,1877.

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UNITED STATES PATENT OFFICE.

ABRAHAM B. KING, OF CAMDEN, OHIO, ASSIGNOR TO OATHARINE KING.

IMPROVEMENT IN SPRING-WHIFFLETREES.

Specification forming part of Letters Patent No. 194,654, dated August28, 1877; application filed January 20, 1877. I

To all whom it may concern:

- Be it known that I, ABRAHAM B. KING, of Camden, in the county ofPreble and State of. Ohio, have invented a new and valuableImprovementin Elastic Whiffietrees; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a a part of this specification, and to the letters and figures ofreference marked thereon.

Figure 1 of the drawings is a representation of a plan view of thisinvention. Fig. 2 is a front view of the same. Fig. 3 is a transversevertical central section.

This invention has relation to whiffletrees; and it consists in theconstruction and novel arrangement, in connection with the tree, of alongitudinal spring arranged in hearings in and provided with acheckband embracing the tree, all as hereinafter shown and described.

In the accompanying drawings, the letter A designates the wooden portionor tree, having at its ends the usual trace loops or fastenings. B Bindicate pivoted arms or bearings, which are arranged in rear of thearms of the tree. Usually it is designed to use two pairs of pivotedarms, one pair being arranged between the center and each end of thetree and the arms comprising the pair being attached on the upper andlower sides of the same, as shown in the drawings. The rear ends of eachpair of arms are connected by a suitable pin, or other bearing, to theends of the spring 0. This is usually made with several leaves, thelongest having its ends connected with the bearings at the ends of thearms.

The spring may be straight, but is by preference reversely curved, sothat its convex side will be toward the tree. The other plates ,of thespring are attached on the convex or inner side of the longest leafmentioned, by means of a suitable clip or fastening.

D represents the check-band. This is a broad loop fastened above andbelow, and extending forward from the spring to which it is fastened,around the central or broadest portion of the tree, so that its lengthwill be at right angles with the length of the latter. It is designed toplay freely on the tree, back injure its elasticity.

.moves to the rear and forth, according to the strain on the spring, andto have sufficient length to allow the spring full play and to check itat this limit and prevent further tension, which would The rear end ofthis band may form the clip whereby the leaves of the spring are securedtogether; and in front of said leaves, a bolt, a, is extendedvertically, to the ends of which the clevis is pivoted.

In order that the band shall not have lateral play, guide-studs c arearranged on each side of it on the whiffletree. Similar studs d areprovided at the inner edges of the bearing arms of the spring, in rearof their pivotal points, to check their inward swing, when the spring isnot under strain. In this manner. the parts are kept in proper relativeposition and all lateral swinging or shaking is prevented. t

In order to determine the degree of strain in the draft, it is designedto sometimes graduate the upper surface of the check-band, as indicatedat e, and to provide an index, t", on the tree, which, being fixed inposition, will indicate the tension on the scale as the band under thestrain of the draft.

. Instead of using springs having theirbearings in pivoted arms, it iscontemplated to sometimes employ springs having their ends curvedforward toward the tree and inward and attached thereto and the partsmay be otherwise modified in ways which will readily occur to thoseskilled in the art without departing from the nature of the invention.

What I claim as new, and desire to secure by Letters Patent, is I Awhiftletree having a sliding-draft reliefband, D, embracing its middleportion, and a rear longitudinal spring, 0, connected centrally to saidrelief-band, and at its ends to bearing-arms extending to the arms ofthe whiffletree, substantially asspecified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

ABRAHAM B. KING.

Witnesses G. M. ROHRER, A. G. ROHRER.

